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Question 415:



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Sort your data from lowest to highest. Count up all your values. If you have for example 20 values, the 25th percentile is equal to the 5th values (20*.25 = 5). The 75th percentile is the 15th value (20*.75 = 15).  It doesn't always work as nicely if you have certain odd numbers. For example, at a sample of 14, the 25th percentile is (14*.25 = 3.5).  If possible, pick a value between 3 and 4.

Once you have the 25th & 75th you just subtract the 75th-25th percentile and get the middle 50 percent of values.

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